/*
 * Copyright 2018 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.samples.apps.iosched.shared.fcm

/**
 * Used to subscribe users to server topics.
 */
interface TopicSubscriber {
    /**
     * Used to subscribe all users that open the schedule screen to a topic, to receive future
     * updates.
     */
    fun subscribeToScheduleUpdates()

    /**
     * If a user is registered subscribe them to the "registered" topic.
     */
    fun subscribeToAttendeeUpdates()

    /**
     * If a user is registered and signs out, unsubscribe them from the "registered" topic to stop
     * receiving notifications.
     */
    fun unsubscribeFromAttendeeUpdates()
}